Western Australia Surf Forecast by Craig Brokensha (issued Wednesday June 15th)

Best Days: Keen surfers tomorrow morning Perth and Mandurah selected spots, Perth and Mandurah Monday (possibly Margs), Perth and Mandurah Tuesday morning

Features of the Forecast (tl;dr)

• Mid-period W'ly swell easing tomorrow with strong NW winds in the South West (early fresh NE Perth and N/NE Mandurah)
• Large, stormy mix of swells building Fri PM with strong N/NW tending W winds
• XL stormy W'ly swell building Sat with strong W/NW-W winds
• Easing swell Sun PM with strong SW winds, abating
• Easing swell Mon with light E/NE tending variable winds in Perth and Mandurah possibly variable Margs

Recap

Peaky fun waves to 2-3ft across Perth yesterday, a little bumpy and similar in size across Mandurah while Margs saw light winds but lumpy, raw and average surf.

Today winds have started to strengthen ahead of an approaching frontal system bringing poor conditions to the South West and bumpy/choppy surf in Mandurah and Perth.

This week and weekend (Jun 16 - 19)

We're looking at similar conditions tomorrow morning to today with a gusty NW breeze across the South West, fresh NE winds in Perth and N/NE breezes across Mandurah.

This will be with a new mid-period W/SW swell which should be filling in this afternoon, though easing back from 4-6ft in the South West and 2ft+ across Perth and Mandurah. Northern corners will be best with the local winds before things deteriorate as winds strengthen and shift more N/NW across the metro regions.

From Friday we'll see all locations falling under a strengthening onshore flow as a broad and multi-threaded mid-latitude frontal progression pushes up and into us bringing strong N/NW tending W winds and a mix of building mid-period W'ly swell and localised windswell.

Stormy, building surf to 8ft+ is due across the South West by Friday afternoon with 3ft surf in Perth and Mandurah.

Larger surf will develop on Saturday, peaking into the afternoon as the peak in mid-period energy fills in along with strong W/NW-W winds. The South West will reach 12ft+ with 3-5ft in Mandurah and 4ft across Perth.

Come Sunday the frontal progression will start to weaken while moving east, bringing strong SW winds, easing through the day and easing, stormy surf from a similar size to Saturday afternoon.

Now from Monday onwards things are interesting as the models diverge regarding a small high moving in behind the progression. Either way Perth and Mandurah will become much cleaner but the big question is whether Margs will clean up or see lingering onshore winds.

In either case the swell will still be raw and lumpy but improving, easing back from 8ft+ in the South West, 3-4ft in Mandurah and 2-3ft across Perth.

The next approaching frontal progression looks to bring increasing NW winds ahead of a SW change mid-week and a fresh cycle of building W/SW swell through the middle to end of next week, but with the current divergence we'll have to keep an eye on developments. Check back Friday.